FastColoredTextBoxNS.Ruler.OnPaint C# (CSharp) Method

        protected override void OnPaint(PaintEventArgs e)
        {
            if (target == null)
                return;

            Point car = PointToClient(target.PointToScreen(target.PlaceToPoint(target.Selection.Start)));

            Size fontSize = TextRenderer.MeasureText("W", Font);

            int column = 0;
            e.Graphics.FillRectangle(
                new LinearGradientBrush(new Rectangle(0, 0, Width, Height), BackColor, BackColor2, 270),
                new Rectangle(0, 0, Width, Height));

            float columnWidth = target.CharWidth;
            var sf = new StringFormat();
            sf.Alignment = StringAlignment.Center;
            sf.LineAlignment = StringAlignment.Near;

            var zeroPoint = target.PositionToPoint(0);
            zeroPoint = PointToClient(target.PointToScreen(zeroPoint));

            using (var pen = new Pen(TickColor))
            using (var textBrush = new SolidBrush(ForeColor))
                for (float x = zeroPoint.X; x < Right; x += columnWidth, ++column)
                {
                    if (column%10 == 0)
                        e.Graphics.DrawString(column.ToString(), Font, textBrush, x, 0f, sf);

                    e.Graphics.DrawLine(pen, (int) x, fontSize.Height + (column%5 == 0 ? 1 : 3), (int) x, Height - 4);
                }

            using (var pen = new Pen(TickColor))
                e.Graphics.DrawLine(pen, new Point(car.X - 3, Height - 3), new Point(car.X + 3, Height - 3));

            using (var pen = new Pen(CaretTickColor))
            {
                e.Graphics.DrawLine(pen, new Point(car.X - 2, fontSize.Height + 3), new Point(car.X - 2, Height - 4));
                e.Graphics.DrawLine(pen, new Point(car.X, fontSize.Height + 1), new Point(car.X, Height - 4));
                e.Graphics.DrawLine(pen, new Point(car.X + 2, fontSize.Height + 3), new Point(car.X + 2, Height - 4));
            }
        }